High precision mass measurements of intermediate-mass neutron-deficient nuclei via MRTOF-MS

Precision mass measurements of ⁶³Cu, ⁶⁴⁻⁶⁶Zn, ⁶⁵⁻⁶⁷Ga, ⁶⁵⁻⁶⁷Ge, ⁶⁷As, ^79,81Br, ⁷⁹Kr, ^80,81Rb, and ^79,80Sr were performed with a multireflection time-of-flight mass spectrograph. The masses of these nuclides were determined by the single reference method using isobaric references. In order to obtain precise results, time-of-flight drift compensations were performed and a phenomenological fit function was employed. Consequently, in the case of ⁶⁵Ga, a mass uncertainty of 2.1 keV, corresponding to a relative precision of δm/m = 3.5 × 10⁻⁸, was obtained and the mass value is in excellent agreement with the 2016 Atomic Mass Evaluation. (author)